Des:After getting married and moving into my husbands house, I started living with my husbands sister Mitsuki, who is a high school girl. But sometimes, I was worried about the way Mitsuki-chan looked at me. And an unexpected kiss in the morning. She thought it was just a prank from a fake girl, but I was told that before she got married, when she was dating her brother, she had been thinking that it would be nice to have a sister like this come to my house... .